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The 2011 Mazda CX7 should use SAE 5w-30 full synthetic oil with a capacity of 5.3 quarts. The oil is important for keeping the engine's internal parts cool and lubricated, preventing wear and damage by reducing friction between moving parts. An oil change for your Mazda typically costs between $50 and $80 and should be done every 7,500 to 10,000 miles. Signs that it's time for an oil change include increased engine noise, transmission shifting problems, shaking while idling, excess exhaust, an oil smell in the vehicle, or if the Check Engine or Oil Change lights come on.
The preferred oil for the 2011 Mazda CX7 is synthetic 0W-20.
How about "5W-30 is a type of motor oil recommended for use in various vehicles"?